Another exception was thrown: There are multiple heroes that share the same tag w

报错：

I/flutter (18994): Another exception was thrown: There are multiple heroes that share the same tag within a subtree.

解决：在FloatingActionButton中添加一个heroTag:''

new FloatingActionButton(heroTag:'demandsDetail',child: new Icon(Icons.add,color: Color.fromRGBO(63, 81, 181, 0.8),size: 34,),onPressed: () {Navigator.pushNamed(context, 'release_requirements');},
),

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Another exception was thrown: There are multiple heroes that share the same tag w

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